I'm not sure on the spelling but I think its "diatomaceaous earth" but it's the skeletal remains of diatomes- little ocean critters with sharp shells, that any insect walks across will die. It is a harmless fine powder to us and our pets- but rips open the bodies of the bugs.
It works really well if you make lines of it all along your windows and doorways, and anywhere you see a lot of ants (cat boxes, etc)
Also, you may want to keep ALL of your food in the fridge or airtight jars for a little while, so as not to tempt them.
Hope that helps! :)
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